External quality assessment in microbiology: Comparison of results from Belgian and Canadian laboratories with regard to their ability to identify Streptococcus pyogenes228, Vernelen, Kris, Noble M.A., and Libeer J.C. , Accreditation and Quality Assurance, 0/0/2008, Volume 13, Issue 9, Number 504, p.501 - 504, (2008)